Autism/ADHD

I am struggling to understand why so many children are being diagnosed with Autism and ADHD.

Do you think this has always existed but we didn't really understand what it was and when I think back some children were called very naughty or backward and they had these two conditions.

Someone said to me poor parenting and the gentle parenting of today, the diets the parents have had, X Boy use. tablet and 'phone use.

Everyone's child I come across has these problems and really puzzling me as to why?

Comments please.